The lens is situated within the eye. By altering its form, the lens modifications the focal distance of the attention. In different phrases, it focuses the sunshine rays that cross by means of it (and onto the retina) with the intention to create clear photos of objects which might be positioned at numerous distances. It additionally works along with the cornea to refract, or bend, gentle.
The lens is of ellipsoid, biconvex form. An ellipsoid is just like a sphere however stretched out, like an olive, and biconvex means it’s rounded outward on each side. The lens is about 10 mm throughout and four mm from entrance to again in adults, though its form and measurement varies because it modifications its focus.
The lens consists of the lens capsule, the lens epithelium, and the lens fibers. The lens capsule is the graceful, clear outermost layer of the lens, whereas the lens fibers are lengthy, skinny, clear cells that kind the majority of the lens. The lens epithelium lies between these two and is accountable for the secure functioning of the lens. It additionally creates lens fibers for the lifelong progress of the lens.
Widespread illnesses of the lens embrace cataracts, which trigger opacity, or cloudiness, within the lens. Different frequent illnesses are presbyopia, ectopia lentis, aphakia, and nuclear sclerosis.